Hey guys the car just started this a few weeks ago.. Its pulls awesome then right after I shift it stops pulling the I let off and hit it again and it pulls again?? Sometimes it will do it under load around 3K rpms to.. Could it be the PPRV? I changed the plugs and it runs better now but still doing this and it does it worse when hot... oh and it doesnt do it all the time just once in a while, But im trying to fix it before i take it to the track in a week or so..